mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
3d443691ed
The tsk parameter in arch_set_user_pkey_access() is never used in the function implementations across all architectures (arm64, powerpc, x86). Link: https://lkml.kernel.org/r/20260219063506.545148-1-sgsu.park@samsung.com Signed-off-by: Seongsu Park <sgsu.park@samsung.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2023 Arm Ltd.
|
|
*
|
|
* Based on arch/x86/include/asm/pkeys.h
|
|
*/
|
|
|
|
#ifndef _ASM_ARM64_PKEYS_H
|
|
#define _ASM_ARM64_PKEYS_H
|
|
|
|
#define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2)
|
|
|
|
#define arch_max_pkey() 8
|
|
|
|
int arch_set_user_pkey_access(int pkey, unsigned long init_val);
|
|
|
|
static inline bool arch_pkeys_enabled(void)
|
|
{
|
|
return system_supports_poe();
|
|
}
|
|
|
|
static inline int vma_pkey(struct vm_area_struct *vma)
|
|
{
|
|
return (vma->vm_flags & ARCH_VM_PKEY_FLAGS) >> VM_PKEY_SHIFT;
|
|
}
|
|
|
|
static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma,
|
|
int prot, int pkey)
|
|
{
|
|
if (pkey != -1)
|
|
return pkey;
|
|
|
|
return vma_pkey(vma);
|
|
}
|
|
|
|
static inline int execute_only_pkey(struct mm_struct *mm)
|
|
{
|
|
// Execute-only mappings are handled by EPAN/FEAT_PAN3.
|
|
return -1;
|
|
}
|
|
|
|
#define mm_pkey_allocation_map(mm) (mm)->context.pkey_allocation_map
|
|
#define mm_set_pkey_allocated(mm, pkey) do { \
|
|
mm_pkey_allocation_map(mm) |= (1U << pkey); \
|
|
} while (0)
|
|
#define mm_set_pkey_free(mm, pkey) do { \
|
|
mm_pkey_allocation_map(mm) &= ~(1U << pkey); \
|
|
} while (0)
|
|
|
|
static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
|
|
{
|
|
/*
|
|
* "Allocated" pkeys are those that have been returned
|
|
* from pkey_alloc() or pkey 0 which is allocated
|
|
* implicitly when the mm is created.
|
|
*/
|
|
if (pkey < 0 || pkey >= arch_max_pkey())
|
|
return false;
|
|
|
|
return mm_pkey_allocation_map(mm) & (1U << pkey);
|
|
}
|
|
|
|
/*
|
|
* Returns a positive, 3-bit key on success, or -1 on failure.
|
|
*/
|
|
static inline int mm_pkey_alloc(struct mm_struct *mm)
|
|
{
|
|
/*
|
|
* Note: this is the one and only place we make sure
|
|
* that the pkey is valid as far as the hardware is
|
|
* concerned. The rest of the kernel trusts that
|
|
* only good, valid pkeys come out of here.
|
|
*/
|
|
u8 all_pkeys_mask = GENMASK(arch_max_pkey() - 1, 0);
|
|
int ret;
|
|
|
|
if (!arch_pkeys_enabled())
|
|
return -1;
|
|
|
|
/*
|
|
* Are we out of pkeys? We must handle this specially
|
|
* because ffz() behavior is undefined if there are no
|
|
* zeros.
|
|
*/
|
|
if (mm_pkey_allocation_map(mm) == all_pkeys_mask)
|
|
return -1;
|
|
|
|
ret = ffz(mm_pkey_allocation_map(mm));
|
|
|
|
mm_set_pkey_allocated(mm, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int mm_pkey_free(struct mm_struct *mm, int pkey)
|
|
{
|
|
if (!mm_pkey_is_allocated(mm, pkey))
|
|
return -EINVAL;
|
|
|
|
mm_set_pkey_free(mm, pkey);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* _ASM_ARM64_PKEYS_H */
|